:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --bg-hover: #f1f3f5;
  --border: #e9ecef;
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --text-muted: #adb5bd;
  --primary: #0066ff;
  --primary-hover: #0052cc;
  --success: #28a745;
  --warning: #ffc107;
  --danger: #dc3545;
  --info: #17a2b8;
  --sidebar-bg: #1a1d23;
  --sidebar-text: #e9ecef;
  --sidebar-hover: #2d3139;
  --shadow: rgba(0, 0, 0, 0.1);
  --radius: 8px;
}

[data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-card: #1c2128;
  --bg-hover: #21262d;
  --border: #30363d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --primary: #58a6ff;
  --primary-hover: #4a92e0;
  --success: #3fb950;
  --warning: #d29922;
  --danger: #f85149;
  --info: #58a6ff;
  --sidebar-bg: #0d1117;
  --sidebar-text: #e6edf3;
  --sidebar-hover: #21262d;
  --shadow: rgba(0, 0, 0, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
}

.app-container {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-header {
  padding: 24px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-header h2 {
  font-size: 18px;
  font-weight: 600;
}

.nav-menu {
  list-style: none;
  padding: 16px 12px;
  flex: 1;
}

.nav-item {
  margin-bottom: 4px;
}

.nav-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  color: var(--sidebar-text);
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.2s;
}

.nav-item a:hover,
.nav-item.active a {
  background: var(--sidebar-hover);
}

.sidebar-footer {
  padding: 16px 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.logout-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  color: var(--sidebar-text);
  text-decoration: none;
  border-radius: var(--radius);
  transition: background 0.2s;
}

.logout-btn:hover {
  background: var(--sidebar-hover);
}

.main-content {
  margin-left: 260px;
  flex: 1;
  padding: 32px;
  background: var(--bg-secondary);
  min-height: 100vh;
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}

.page-header h1 {
  font-size: 32px;
  font-weight: 700;
}

.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.theme-toggle:hover {
  background: var(--bg-hover);
}

.theme-toggle .sun-icon {
  display: none;
}

.theme-toggle .moon-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
  box-shadow: 0 1px 3px var(--shadow);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon.blue {
  background: rgba(0, 102, 255, 0.1);
  color: var(--primary);
}

.stat-icon.green {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success);
}

.stat-icon.orange {
  background: rgba(255, 193, 7, 0.1);
  color: var(--warning);
}

.stat-icon.purple {
  background: rgba(111, 66, 193, 0.1);
  color: #6f42c1;
}

.stat-icon.red {
  background: rgba(220, 53, 69, 0.1);
  color: var(--danger);
}

.stat-content {
  flex: 1;
}

.stat-label {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

.stat-value {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
}

.content-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px var(--shadow);
}

.card-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-header h2 {
  font-size: 18px;
  font-weight: 600;
}

.card-body {
  padding: 24px;
}

.empty-state {
  text-align: center;
  padding: 48px 24px;
  color: var(--text-secondary);
}

.empty-state svg {
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state p {
  margin-bottom: 16px;
  font-size: 16px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.data-table th {
  font-weight: 600;
  font-size: 14px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table tbody tr:hover {
  background: var(--bg-hover);
}

.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-success {
  background: rgba(40, 167, 69, 0.1);
  color: var(--success);
}

.badge-warning {
  background: rgba(255, 193, 7, 0.1);
  color: var(--warning);
}

.badge-info {
  background: rgba(23, 162, 184, 0.1);
  color: var(--info);
}

.badge-danger {
  background: rgba(220, 53, 69, 0.1);
  color: var(--danger);
}

.action-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.action-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-primary);
  transition: all 0.2s;
}

.action-item:hover {
  background: var(--bg-hover);
  border-color: var(--primary);
}

.action-icon {
  width: 40px;
  height: 40px;
  background: rgba(0, 102, 255, 0.1);
  color: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.action-content h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
}

.action-content p {
  font-size: 14px;
  color: var(--text-secondary);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-secondary {
  background: var(--bg-hover);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 16px;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-danger {
  background: var(--danger);
  color: white;
}

.btn-danger:hover {
  background: #c82333;
}

.compose-container,
.result-container {
  max-width: 1200px;
  margin: 0 auto;
}

.compose-container {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 20px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 14px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"],
.form-group textarea {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
}

.form-group textarea {
  resize: vertical;
}

.form-group input[type="checkbox"] {
  margin-right: 8px;
}

.help-text {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 6px;
}

.form-actions {
  display: flex;
  gap: 12px;
  margin-top: 24px;
}

.email-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.preview-header {
  padding: 16px;
  background: var(--bg-hover);
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.preview-header p {
  margin-bottom: 4px;
}

.preview-body {
  padding: 16px;
  min-height: 200px;
}

.filter-tabs {
  display: flex;
  gap: 8px;
}

.filter-tab {
  padding: 6px 12px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.filter-tab:hover,
.filter-tab.active {
  background: var(--primary);
  color: white;
}

.login-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  padding: 20px;
}

.login-box {
  width: 100%;
  max-width: 400px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: 0 4px 12px var(--shadow);
}

.login-box h1 {
  font-size: 24px;
  margin-bottom: 8px;
  text-align: center;
}

.subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.login-form {
  margin-top: 24px;
}

.alert {
  padding: 12px 16px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  font-size: 14px;
}

.alert-error {
  background: rgba(220, 53, 69, 0.1);
  color: var(--danger);
  border: 1px solid rgba(220, 53, 69, 0.2);
}

.success-icon,
.warning-icon {
  margin: 0 auto 24px;
  width: 80px;
  height: 80px;
}

.success-icon svg {
  color: var(--success);
}

.warning-icon svg {
  color: var(--warning);
}

.result-container .card {
  max-width: 600px;
  margin: 0 auto;
}

.text-center {
  text-align: center;
}

.result-message {
  font-size: 16px;
  color: var(--text-secondary);
  margin: 16px 0 32px;
}

.result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.page-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 24px;
}

.templates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}

.template-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 3px var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.template-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--shadow);
}

.template-thumbnail {
  width: 100%;
  height: 180px;
  background: var(--bg-hover);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.template-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.template-placeholder {
  color: var(--text-muted);
}

.template-content {
  padding: 20px;
}

.template-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 8px;
}

.template-content p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.template-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

.template-date {
  display: flex;
  align-items: center;
  gap: 4px;
}

.template-actions {
  display: flex;
  gap: 8px;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-hover);
}

.form-control {
  width: 100%;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
}

select.form-control {
  cursor: pointer;
}

@media (max-width: 1024px) {
  .content-grid,
  .compose-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    width: 200px;
  }

  .main-content {
    margin-left: 200px;
    padding: 20px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .sidebar {
    display: none;
  }

  .main-content {
    margin-left: 0;
  }
}

.auth-container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  padding: 20px;
}

.logo {
  text-align: center;
  margin-bottom: 32px;
}

.logo h1 {
  font-size: 24px;
  margin-bottom: 8px;
}

.logo p {
  color: var(--text-secondary);
}

.success-message,
.error-message,
.unsubscribe-form {
  text-align: center;
  padding: 20px;
}

.container {
  max-width: 100%;
  margin: 0 auto;
}